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Unique Number of Occurrences Problem

Solved in JavaScript and Ruby

Photo by Ricardo Gomez Angel on Unsplash

There are many different ways to solve the Unique Number of Occurrences problem from LeetCode and I will share my solutions in JavaScript and Ruby in this blog post. Here are the question and a few examples:

Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each

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